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The load decides the power demand not the source. The power supply rating is the maximum sustained load the power supply can provide. You could put a 1000 watt power supply on there and nothing's going to happen unless you short something, then you could arc-weld.

I agree entirely, except that I would prefer 3000w for arc-welding

I think the confusion might be that it is pretty difficult to find a PSU in micro ATX format that is more than 300w. I think the reason for that is that the form factor doesn't support expansion that would require more, so manufacturers don't make them?